Author Topic: Should I ditch my current carb on my Pontiac 301 powered 79 Trans Am?  (Read 68 times)

Offline Ponchonutty

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So some of you read my long winded potential issues with my current Frankensteined quadrajet in which a Holley reman, warped correct carb was swapped around with an Olds tagged unit.  He suggested to me to get another core to do the build since the original carb wasn't a matching unit and would negate the costs making it right.  The builder used the necessary parts from the reman unit in order to keep the idle up circuit as well as the AC cut off when WOT. 

What prompted me wanting to have the carb that was on my turdbird rebuilt is that I could never get a happy place with idle.  The throttle would stick just off idle and got worse the warmer it got.  Well, I think the throttle shaft was bent slightly because when the Frankensteined carb was installed, I still had that issue.  He had to use the shaft in this carb I have now.  I wonder if something else could be swapped wrong causing excessive lean conditions since 2 totally different carbs were mix-matched together?

I handed my car off to my buddy who owns a carshop and is capable around these carbs but not to the level as many of you on here.  Right off the start he recommended getting another carb and throw it on to see how drastic of a change might be seen.  I got another off of a Pontiac 400 out of a 74 Grand Prix.  I haven't had a chance to talk to him to see if he's been able to do this as of yet.

So lets say the current carb is indeed the issue, what do I do from here?  Should I use the 74' carb or should I find a carb off of a late 70's to 80 301 motor?  Where do I draw a line as to how bad is too bad?  Like this 1980 Pontiac carb here.  It looks crazy nasty however the seller said it's all completely free and it's just covered in dirt from sitting on a shelf for decades.  Also one more thing is that I installed a 2004r in this car and the geometry for the TV is extremely important so as not to smoke it.  It's one of the main reasons I want to stay with a quadrajet versus another brand carb or even fuel injection.

Offline quadrajam

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Re: Should I ditch my current carb on my Pontiac 301 powered 79 Trans Am?
« Reply #1 on: September 06, 2025, 07:18:57 PM »
  I cant seem to be able to zoom in on the pictures....??...??

QJ

Offline Ponchonutty

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Not sure why?  I can from my desktop and it says there's been 4 views???